Support for light-emitting elements and lighting device

ABSTRACT

A lighting device comprises a support comprising a mounting section having at least one mounting face. The at least one mounting face has an arrangement direction and comprising at least two contact sections along the arrangement direction. The support further comprises a body section adjacent to the mounting section. The support further comprises a plurality of layered conductors connecting the body section to the at least one mounting face. The lighting device comprises at least one light-emitting element mounted along the arrangement direction of the at least one mounting face such that the at least one light-emitting element is in electrical contact to the at least two contact sections.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.16/923,767, filed Jul. 8, 2020, which claims the benefit of EP PatentApplication No. 19184871.2, filed Jul. 8, 2019, which is incorporated byreference as if fully set forth.

FIELD OF INVENTION

The present disclosure relates to a support for light-emitting elementsin a lighting device, in particular comprising a layered structure, forimproved heat transport and optical characteristics in applications suchas automotive lighting.

BACKGROUND

Recently, efforts have been made to replace traditional light sourcessuch as incandescent light sources comprising a wire filament bylighting devices comprising light-emitting elements such as LEDs. Forsome specific applications, for instance in automobile lighting, it isdesirable to perform a “retrofitting” of such lighting devices. Forexample, it is advantageous if only the traditional light source such asan incandescent light bulb is replaced by a LED lighting device, whilethe remaining elements of the lamps, e.g. optical elements such asreflector cups and lenses, do not require replacement. Hence, there areefforts to offer such retrofitting lighting devices that represent a 1:1replacement for traditional standard light sources, for example H7halogen bulbs.

Configuring lighting devices for retrofitting traditional light sourcesis however challenging. Firstly, as the lighting device is intended tomake use of the same optical elements as a traditional light source, theillumination pattern of the traditional light source has to be mimickedclosely by the arrangement and specification of the light-emittingelements. For example, it may be required that LEDs are arranged in amanner representing the shape of a filament of an incandescent lightsource, with LEDs being arranged along an arrangement direction.Secondly, the heat transport from the LEDs has to be effective to ensurea long lifetime of the LEDs, which is particularly challenging asreproducing the illumination pattern of the traditional light source mayrequire arranging multiple LEDs very close to each other, which may leadto concentration of heat within a small volume. For retrofittingapplications such as in automotive lighting, a high light output isrequired, which also leads to a high heat output of the light-emittingelements. Thirdly, the light-emitting elements have to be provided withelectrical energy in an efficient manner, wherein additional heatgeneration in the electrical connections should be reduced.

There have been attempts to provide supports for LEDs for retrofitapplications based on printed circuit boards (PCBs), which may provideelectrical connection of the LEDs with an effective heat transport.However, PCBs restrict the arrangement of LEDs to a substantially flator two-dimensional shape, so that a mimicking the shape of a filamentwith PCBs as a support is unsatisfactory.

Other supports from the prior art still require to arrange a significantnumber of LEDs connected in parallel on conductors with a smallcross-sections, such that the heat transport may still be optimizedfurther.

WO 2016/156463 A1 refers to a LED module which comprises a heat sinkportion and a LED arrangement mounted on the heat sink portion at a LEDmounting face. The heat sink portion has a shaped sheet metal carrierthat forms a 3D shape, which is basically a pyramid with a rectangularbase. The mounting surface is defined by a flat region on the top of thepyramid-formed carrier.

EP 1 760 391 A2 refers to a light emitting diode bulb comprising a base,a printed circuit board contained with said base and a plurality ofelectrical connectors. A light emitting diode is electrically connectedbetween the conductive plates adjacent to a second end on each of theplurality of electrical connectors. The electrical ends of theconnectors comprise an upper, substantially planar surface and anundercut surface, with the light emitting diodes being positioned on theundercut surfaces.

WO 2009/037645 A2 discloses a LED package for use in a lamp comprising asubstrate with lighting elements, which are arranged regular in a lineand totally covered by an optical element.

US 2003/0006423 A1 discloses a concentrically leaded power semiconductordevice package which includes an inner conductor, an intermediateconductor and an outer conductor. One semiconductor device is attachedto the inner conductor. Attached along the flat face of the innerconductor are a number of semiconductor devices.

JP 2010198847 A refers to a vehicle headlight wherein a light source ismounted on the front of a first of a first section of the flexible boardand a lining member is connected with a rear face of the first section.

SUMMARY

However, it is a drawback of known solutions that current retro fitlighting modules lack the possibility to combine multiple functions inone light source. Further dynamics by dimming or boosting individualLEDs is not possible.

It is thus, inter alia, an object of the invention to provide a supportfor light-emitting elements that provides effective heat transport andelectrical conduction when at least one light-emitting element isarranged on the support. The support also may provide for various shapesand in particular three-dimensional arrangements of light-emittingelements, allowing for optical properties desirable in retrofittingapplications. The invention further relates to a lighting device thatimproves heat transport and the illumination pattern in particular forretrofitting applications. The invention further relates to a method forproducing such a lighting device.

According to a first exemplary aspect of the present invention, asupport for light-emitting elements is proposed, the support comprising:a mounting section with at least one mounting face, wherein the at leastone mounting has an arrangement direction and is configured foraccommodating at least one light-emitting element arranged along thearrangement direction; a body section arranged adjacent to the mountingsection; and conductors for providing electric connection from the bodysection to the at least one mounting face; wherein the at least onemounting face comprises at least two contact sections along thearrangement direction, each contact section corresponding to aconductor, wherein the body protrudes sidewards from the at least onemounting face, and wherein a voltage is applied between any of the atleast two contact sections when the body section is connected to a powersource.

According to a second exemplary aspect of the present invention, alighting device is proposed comprising: a support according to the firstexemplary aspect of the present invention; and at least onelight-emitting element mounted along the arrangement direction of the atleast one mounting face, wherein the at least one light-emitting elementis in electrical contact to the at the least two contact sections.

According to a third exemplary aspect of the present invention, a methodfor producing a lighting device is proposed, in particular a lightingdevice according to the second exemplary aspect of the presentinvention, the method comprising: providing a support according to thefirst exemplary aspect of the present invention; mounting at least onelight-emitting element along the arrangement direction of the at leastone mounting face, wherein the at least one light-emitting element isbrought into electrical contact to the contact sections.

Exemplary embodiments of the first, second, and/or third exemplaryaspect of the present invention may have one or more of the propertiesand/or features described below:

The support comprises a mounting section with at least one mountingface. The mounting face(s) may provide a suitable mounting surface forone or more light-emitting elements. For instance, the mounting face(s)may be at least partially flat or planar to provide an area suitable toaccommodate a light-emitting element such as a LED and/or an LED die.The at least one mounting face has an arrangement direction and isconfigured for accommodating at least one light-emitting elementsarranged along the arrangement direction. The arrangement direction maycorrespond to an extension direction of the at least one mounting faceand/or the at least one light emitting element. For instance, thearrangement direction may correspond to a longest dimension of the atleast one mounting face and/or the at least one light emitting element.The at least one mounting face may in particular be configured such thatmultiple light-emitting elements may be arranged along a line, e.g. astraight line, wherein the arrangement direction corresponds to theorientation of the line of light-emitting elements. In some embodiments,the at least one mounting face may be configured to accommodate only asingle light-emitting element, wherein the light-emitting element hasfor instance an elongated (rectangular) shape with the arrangementdirection corresponding to the direction of elongation.

In embodiments of the support for use in lighting devices that areintended to replace incandescent light sources with a filament, thearrangement direction may correspond to the extension direction of thefilament, i.e. the direction of the longest dimension of the filament.The at least one mounting face may then accommodate at least onelight-emitting element to effectively mimic the illumination of anincandescent light source.

A body section is arranged adjacent to the mounting section, wherein inparticular the body section is in thermal contact to the mountingsection, such that e.g. heat generated by one or more light-emittingelements mounted on the at least one mounting face may be transferredfrom the mounting section to the body section. The body section may inparticular comprise a volume and/or surface configured to provide heatdissipation suitable for the heat generated by light-emitting element(s)and to provide cooling for the light-emitting element(s).

The conductors may provide an electric connection from the body sectionto the at least one mounting face. The body section may for instance beconnected to a power source, e.g. by means of a socket. The conductorsmay provide a transfer of electrical power from the body section to themounting section and therefore to one or more light-emitting elementsmounted on the at least one mounting face. Further, the body section mayact both as a heat sink as well as a heat conductor to the environmentof the support.

The at least one mounting face comprises at least two contact sectionsalong the arrangement direction. Contact sections may for example beconfigured as contact patches or contact areas on the surface of themounting face(s) that allow for an electrical contact with alight-emitting device, for instance by soldering or by means of aconductive adhesive. Each contact section corresponds to a conductor andis therefore electrically connected to the body section such that a forinstance a voltage may be applied between neighboring contact sectionswhen the body section is connected to a power source.

As already mentioned above, the body section may provide an electricalconnection to the at least one mounting face and may act simultaneouslyas a heat sink as well as a heat conductor, which is particularlyadvantageous when light-emitting elements with a high heat output areused, e.g. LED light sources for high current applications such asautomotive head lighting. As the body section protrudes sidewards fromthe at least one mounting face, in particular the volume of the bodysection is enlarged, and the body section provides significantlyimproved heat transfer from the mounting section. The electricalconductivity may also be improved due to an enlarged cross section ofthe conductors, allowing to supply the light-emitting elementsaccommodated on the at least one mounting face with high currents.Further, it has been found that the support according to the inventionmay allow for a close mimicking of the illumination of traditional lightsources such as incandescent light sources based on a filament. Inparticular, the illumination pattern of light sources such as halogenbulbs may be reproduced very closely with light-emitting elements (e.g.at least one LED) based on the support. Hence, the support according toinvention may provide an optimization of optical, thermal, andelectrical aspects of retrofitting light sources.

Under “protruding sidewards”, it may in particular be understood thatwhen a viewer faces the at least one mounting face (for instance in adirection perpendicular to the surface of the mounting face), the bodysection extends at least beyond one edge of the at least one mountingface. For instance, the body section may protrude sidewards relative tothe arrangement direction in that the body section extends beyond atleast one edge of the at least one mounting face, wherein the at leastone edge extends substantially parallel to the arrangement direction.

A voltage is applied between any of the at least two contact sectionswhen the body section is connected to a power source. For instance, incase of two contact sections a voltage may be applied between those twocontact sections. In case of more than two, e.g. three contact sections,a voltage may be applied any two of the three contact sections. Forinstance, a voltage may be applied between a first and second contactsection, and/or between the first and a third contact section, and/orbetween the second and the third contact section, to name but a fewnon-limiting examples. Further, in case of a plurality of contactsections (e.g. at least two contact sections), it is enabled to forinstance apply a voltage applied between two different contact sectionswhen the body section is connected to a power source. In this way, incase of a plurality of light-emitting elements being arranged on themounting section, individual combinations of the plurality oflight-emitting elements may be addressed to emit light when the bodysection is connected to a power source.

According to an exemplary embodiment of the invention, the supportfurther comprises an insulating section separating two neighboringcontact sections of the of at least two contact section. Thus, eachneighboring contact section of the at least two contact sections may beseparated by an insulating section. Such an insulating section may beformed by an insulator.

According to an exemplary embodiment of the invention, a further voltageis applied between any of at least two further contact sections of theat least two contact sections when the body section is connected to apower source. It will be understood that in this exemplary embodiment,the support comprises at least four contact sections. Thus, a firstvoltage and, e.g. in parallel, a second voltage, may be appliedrespectively between any of the contact sections when the body sectionis connected to a power source. The first voltage and the second voltagemay be of a different value.

According to an exemplary embodiment of the invention, at least onecontact section is not connected so that a voltage is not applied tosaid at least one contact section when the body section is connected toa power source. When a voltage is applied between at least two contactsections comprised by the support, and at least one contact section isrequired to be not connected, it will be understood that then themounting section comprises at least three contact sections. Whilebetween any two contact sections can be applied with a voltage when thebody section is connected to a power source, at least one contactsection may be not connected so that a voltage or the voltage is notapplied.

According to an exemplary embodiment of the invention, the body sectionfurther comprises at least one sensor, wherein the at least one sensoris coupled to at least two contact sections (e.g. said at least twocontact sections of the mounting section) so that information gatheredby the at least one sensor is at least readable via the coupling. The atleast one sensor may be configured to gather (e.g. measure) information.The gathered information can be read, e.g. by another entity to becomprised by or connectable to the support so that the informationgathered by the at least one sensor can be utilized by the other entity.Further, via the coupling, the at least one sensor may be controllable,e.g. triggering that the at least one sensor initiates to gather (e.g.measure) information, and/or that the at least one sensor is triggeredto output gathered information, or a combination thereof, to name but afew non-limiting examples.

According to an exemplary embodiment of the invention, the at least onesensor is located on a top side, and/or on at least one side of at leastthree sides of the body section connected at least partially with eachother. In principle, the at least one sensor may be mounted in anyposition to the support, as far as reasonable. This may for instancerefer to specific kinds of the at least one sensor. For instance, incase a temperature information indicative of a temperature in a vicinityof the at least one light emitting element, it may for instance beconsidered to be reasonable to position the at least one sensor in thevicinity of the at least one light emitting element. As far as the atleast one sensor can be coupled so that information gathered by the atleast one sensor are readable, the actual position of the at least onesensor may be selected to a user desire.

According to an exemplary embodiment of the invention, the at least onesensor is at least one temperature sensor to gather a temperaturerespectively a temperature information of the support, or of one or morecomponents comprised by the support. An example of at least onetemperature sensor is a thermocouple.

According to a next exemplary embodiment of the invention, the at leastone mounting face is configured for accommodating multiplelight-emitting elements arranged along the arrangement direction. Thelight-emitting elements may for example be arranged along thearrangement direction in a line, in particular in a straight line torepresent the extension direction of a filament. The at least onemounting face may comprise at least three alternating contact sectionsalong the arrangement direction, each alternating contact sectioncorresponding to a conductor and being separated by an insulatingsection. In an embodiment, the alternating contact sections areconfigured to provide alternating polarities. For instance, thepolarities between neighboring contact sections are reversed in respectto each other (such as sequences like +/−/+ or −/+/−). Additionally oralternatively, at least one contact sections may be not connected (nc)so that sequences like +/nc/− or −/nc/+ are enabled. The light-emittingelements may be brought into contact to two contacting sections withdifferent polarities, e.g. light-emitting elements may be brought intocontact to two neighboring alternating contacting sections. By enablingto apply a voltage between any of the at least two contact sections,multiple lighting functions, such as low beam, DRL (Daytime RunningLight), PL (Position Light), or a combination thereof, and/or providingbeam dynamics, such as boosting, dimming, fast switching, or acombination thereof with the same support is enabled. It will beunderstood that the specific lighting function may depend upon thespecific light-emitting elements, or the combination of multiple lightemitting elements that are comprised by the support.

For example, multiple light-emitting elements may be arranged along thearrangement direction in a line, e.g. in a “1×N”-configuration. Eachlight-emitting element of the “1×N”-configuration arranged along thearrangement direction may be in contact to a different pair ofalternating contact sections. Configurations with multiplelight-emitting elements being in contact to the same pair of alternatingcontact sections are also possible, e.g. for arrays of light-emittingelements such as “2×N”-configurations, “3×N”-configurations or evenlarger arrays.

By providing at least three alternating contact sections along thearrangement direction, heat transfer and electrical conduction tolight-emitting elements mounted on the mounting faces may be improved inthat the number of conductors providing heat transfer and electricalconduction is increased, and heat may in particular be transferredeffectively to the body section. For example, in a “1×N”-configurationwith N light-emitting elements arranged along the arrangement direction,N+1 contact sections and N+1 conductors may be provided to optimize heattransfer. The support according for the invention therefore may offerimproved efficiency and lifetime of light-emitting elements compared tosimple columnar shapes of the prior art, in which multiplelight-emitting elements are connected in parallel and heat transfer iseffected via the same conductors. Providing at least three alternatingcontact sections also opens the possibility to operate single ormultiple light-emitting elements independently of each other.

According to another exemplary embodiment of the invention, the mountingsection comprises at least two mounting faces. By using multiplemounting faces, the illumination provided by a filament can be mimickedwith higher precision. For instance, the arrangement direction of eachmounting face may be substantially parallel to each other, wherein themounting faces represent different sides of the filament. In particular,at least two mounting faces are arranged adjacent to each other, suchthat a continuous area for mounting light-emitting elements is obtained.At least two mounting faces may be arranged substantially parallel toeach other, for example, to obtain several areas of illumination towardsthe same direction and in particular for mimicking light sources withmultiple filaments. At least two mounting faces and in particularadjacent mounting faces may be arranged at an angle to each other, forinstance with an enclosing angle in the range of 45° to 135°, inparticular 45° to 75° or substantially perpendicular to each other. Forinstance, the mounting faces arranged at an angle to each other mayrepresent different sides of a filament and/or provide an increasedangle of illumination.

According to another exemplary embodiment of the invention, the mountingsection comprises three mounting faces. Further, one of the threemounting faces may be arranged between the other two mounting surfacesand may optionally be arranged directly adjacent to the other twomounting faces. The mounting section may for example comprise foursides, with three sides providing the mounting faces and the fourth sideproviding contact to the body section. In particular, one of the threemounting faces may be arranged with an enclosing angle of 45° to 135°,in particular 45° to 75° or substantially perpendicular to the other twomounting faces.

According to an exemplary embodiment of the invention, at least onelight-emitting element of the multiple light-emitting elements isconfigured to emit a light of different wavelength than one or more ofthe other light-emitting elements of the multiple light-emittingelements. The different wavelength and/or intensities with which arespective light-emitting element may emit light may enable that themultiple light emitting elements together emit an additive coloraccording to the mixture of the different wavelength.

According to an exemplary embodiment of the invention, the at least onelight emitting element configured to emit a light of differentwavelength is further configured to emit a light with a wavelengthrepresenting a color of yellow or blue. In case at least onelight-emitting element of the multiple light-emitting elements areconfigured to emit a light with a wavelength representing a color ofyellow or blue, it is enabled that light of a known light bulb can bemimicked, wherein a mixture of light comprising the color of blue isreferred to as cold-white, and a mixture of light comprising the colorof white is referred to as warm-white.

According to an exemplary embodiment of the invention, the body sectionhas at least in sections an increasing cross-sectional area withincreasing distance from the mounting section. With this, the opticalproperties of a lighting device based on the support may be furtherimproved in that a smaller amount of light emitted by light-emittingelements accommodated in the mounting section is blocked by the bodysection, while the body section may be provided with a high volume andsurface area to optimize the thermal properties. In particular, when atriangular cross section is provided at least in sections with themounting section being arranged on an edge of the triangular crosssection, the volume and surface area of the body section is optimizedwhile the amount of light blocked or reflected by the body section canbe controlled by choosing an appropriate opening angle of the triangularcross section. The opening angle of the triangular cross section may forinstance be chosen for a large volume of the body section (largeropening angles) or larger angles of illumination (smaller openingangles).

In some embodiments, the triangular cross section may have an openingangle of 0° to 90°, i.e. >0° to 90°. In this range, the thermalproperties of the body are sufficient for many applications whileproviding an angle of illumination that is suitable in particular forretrofitting applications. When an opening angle in the range of 30° to45° is chosen, the angle of illumination may be improved. Forapplications with higher heat generation requiring a higher heattransfer by the body section, opening angles in the range of 50° to 70°,in particular about 60° have been found to be advantageous.

The mounting section and the body section comprise a layered structureof conductors and preferably also of insulating layers. A layeredstructure represents a particularly simple configuration to provide themounting section and/or body section with conductors, wherein inparticular the mounting section and/or body section may integrally beformed by the layered structure. The conductors may also form at leastpart of the contact sections, such that the mounting face(s) may alsocomprise a layered structure of contact sections.

According to another exemplary embodiment of the invention, theconductors comprise metallic sheet material. By using sheet material, alayered structure of the body section and/or mounting section may beprovided in a particularly simple manner, wherein the support may beproduced cost-effectively. For instance, the size and thickness of sheetmaterial may be chosen according to the requirements in electrical andthermal conductivity of the support. Different metallic materials arepossible as a basis for the sheet material. In an embodiment, themetallic sheet material is based or consists of copper. Copper mayprovide very high electrical and thermal conductivity in view ofacceptable material costs.

According to another exemplary embodiment of the invention, the metallicsheet material comprises a main face and side faces, wherein each of thecontact sections is respectively at least partially formed by a sideface of metallic sheet material. The main face of the sheet material maybe the surface of the sheet material with the largest dimensions. Whenthe contact sections are formed by a side face of the metallic sheetmaterial, for instance, the contact sections may have appropriate(small) dimensions for an electrical and thermal contact to at least onelight emitting element, while the metallic sheet material may provide alarge volume and cross section for electrical and thermal transport.

An extension direction of the layered structure of conductors andpreferably also of insulating layers extends substantially perpendicularto the arrangement direction of the at least one mounting face in themounting section. In particular, the layered structure is based onmetallic sheet material extending substantially perpendicular to thearrangement direction of the at least one mounting face. The extensiondirection in this sense may represent a direction that is parallel tothe layers of the layered structure. As the electrical and thermaltransport may predominantly be provided by the conductors (e.g. themetallic sheet material), with an extension direction beingsubstantially perpendicular to the arrangement direction, a very directand effective electrical and thermal transfer from the mounting sectionto the body section can be obtained.

In other embodiments, the extension direction of the layered structureof conductors, in particular of the metallic sheet material, andinsulating layers extends substantially parallel to the arrangementdirection of the at least one mounting face. Under “substantiallyperpendicular”, angles of 90°+/−10° and in particular of 90°+/−5° may beunderstood. Under “substantially parallel”, angles of 0°+/−10° and inparticular of 0°+/−5° may be understood.

The layered structure of conductors (e.g. the metallic sheet material)and preferably also of insulating layers comprises an angled section.With an angled section, the mounting section may be arranged in aspecific orientation in respect to a length of the body section, i.e. inrespect to a longest dimension of the body section. For example, thebody section may have a first end configured for an electricalconnection to a power source, e.g. via a socket, a second end oppositethe first end and side faces connecting the first end to the second end.The mounting section may be provided at a side face of the body, whereinthe heat transfer is improved further. In particular, the angled sectionis configured such that the length of the body section extendssubstantially parallel to the arrangement direction. Besides optimizingheat transfer, such an arrangement resembles the arrangement in avariety of traditional light sources.

According to a next exemplary embodiment of the invention, the at leastone mounting face is configured for accommodating multiplelight-emitting elements arranged along the arrangement direction. Thelight-emitting elements may for example be arranged along thearrangement direction in a line, in particular in a straight line torepresent the extension direction of a filament. The at least onemounting face may comprise at least three alternating contact sectionsalong the arrangement direction, each alternating contact sectioncorresponding to a conductor and being separated by an insulatingsection. In an embodiment, the alternating contact sections areconfigured to provide alternating polarities. For instance, thepolarities between neighboring contact sections are reversed in respectto each other (such as sequences like +/−/+ or −/+/−). Thelight-emitting elements may be brought into contact to two contactingsections with different polarities, e.g. light-emitting elements may bebrought into contact to two neighboring alternating contacting sections.

For example, multiple light-emitting elements may be arranged along thearrangement direction in a line, e.g. in a “1×N”-configuration. Eachlight-emitting element of the “1×N”-configuration arranged along thearrangement direction may be in contact to a different pair ofalternating contact sections. Configurations with multiplelight-emitting elements being in contact to the same pair of alternatingcontact sections are also possible, e.g. for arrays of light-emittingelements such as “2×N”-configurations, “3×N”-configurations or evenlarger arrays.

By providing at least three alternating contact sections along thearrangement direction, heat transfer and electrical conduction tolight-emitting elements mounted on the mounting faces may be improved inthat the number of conductors providing heat transfer and electricalconduction is increased, and heat may in particular be transferredeffectively to the body section. For example, in a “1×N”-configurationwith N light-emitting elements arranged along the arrangement direction,N+1 contact sections and N+1 conductors may be provided to optimize heattransfer. The support according for the invention therefore may offerimproved efficiency and lifetime of light-emitting elements compared tosimple columnar shapes of the prior art, in which multiplelight-emitting elements are connected in parallel and heat transfer iseffected via the same conductors. Providing at least three alternatingcontact sections also opens the possibility to operate single ormultiple light-emitting elements independently of each other.

The lighting device according to the second aspect comprises a supportaccording to the first aspect and at least one light-emitting elementmounted along the arrangement direction of the at least one mountingfaces. The at least one light-emitting element is in electrical contactto at least two contact sections, for example in that contact patches ofthe at least one lighting element are in respective electrical contactto the contact sections. An electrical contact and/or mechanicalconnection may for instance be based on a soldered contact (e.g. bymeans of solder paste) and/or a contact with a conductive adhesive. Theat least one light-emitting element may be operated by applying avoltage to the conductors that are associated with the correspondingcontact sections. For instance, the body section may be configured toprovide electrical contact to a power source.

Accordingly, in a next embodiment of the invention, the lighting devicemay further comprise a socket for connection to a power source, whereinthe socket is connected to the body section. The socket is in particulara standard socket suitable for the intended application and inparticular for the required type of retrofitting. In some embodiments,the socket may be a standard socket of a halogen light bulb and/or alight bulb for automotive applications. One example of such a socket isa H7 socket.

The body section and the mounting section with the at least one mountingface may be arranged to mimic the arrangement of a filament and themounting in a traditional light source. For instance, the arrangementdirection and the arrangement of the light-emitting element(s) inparticular correspond to the arrangement of a standard filament such asa halogen filament. When a socket is used, in particular the distanceand orientation of the mounting face(s) to the socket may correspond tothe distance and orientation of a filament to a socket in a traditionallight source.

With the method according to the third aspect, the at least onelight-emitting elements is brought into electrical contact to thecontact sections, for example in that contact patches of the at leastone lighting element are electrically connected to the contact sections.The electrical contact may for example be established by means ofsoldering, in particular by using solder paste, and/or by usingconductive adhesive.

According to an exemplary embodiment of the invention, providing thesupport may comprise a stacking of metallic sheets. As mentioned above,a layered structure of conductors may be provided by using metallicsheet material such as copper sheets. The stacked metallic sheetmaterial may provide the shape of the body section and/or the mountingsection, as well as the conductors for providing electric connectionfrom the body section to the at least one mounting face. In particular,metallic sheet may be stacked on the main faces of the metallic sheets.Insulating layers between the metallic sheets may be disposed to preventelectrical contact between the metallic sheets. In some embodiments,metallic sheet material may be provided as composite material with oneor more insulating layers on the main face(s). In another exemplaryembodiment, an adhesive is disposed on the metallic sheet materialbefore and/or during stacking to form at least part of the insulatinglayers between the metallic sheets. By using an adhesive, the metallicsheets may be mechanically connected and insulated from each othersimultaneously.

According to another exemplary embodiment of the invention, the metallicsheets are bent to form an angled section. A bending may be performedbefore the stacking of the sheets such that the sheets are at leastpartially brought into the shape required for the support. It is alsopossible that a bending is performed during or after stacking of themetallic sheets. For instance, a stack of metallic sheets with insulatedlayers disposed in between the metallic sheets may be provided as acomposite material or semi-finished product and bent into the shape ofthe support.

According to another exemplary embodiment of the invention, providingthe support comprises a material removal, in particular after a stackingof metallic sheets. For example, metallic sheets in a regular shape suchas a rectangular shape may be used for stacking and providing at leastpart of the body section and/or mounting section. To obtain more complexshapes of the support, for instance the aforementioned triangular crosssection of at least sections of the body section, specific shapes of oneor more mounting faces such as mounting faces arranged at an angle toeach other, etc., material of the metallic sheet material and/or theinsulating layers may be removed. For example, the shape of the supportmay be at least partially obtained by milling, grinding, cutting, and/oretching.

According to another exemplary embodiment of the invention, the mountingof the at least one light-emitting element comprises: removably fixingthe at least one light-emitting element on a supporting layer; applyinga contact material on the at least one light-emitting element; andapplying the at least one light-emitting element fixed on the supportinglayer to the at least one mounting face, wherein the contact materialconnects the at least one light-emitting element to the contactsections. As the mounting face(s) may have a complex shape and may inparticular be arranged in a three-dimensional (non-flat) manner, areliable positioning of solder may not be possible by means of standardtechniques such as solder masks, for instance. Solder masks may bedifficult to apply to complex shaped and comparably small mountingfaces. Further, when solder is disposed near the edge of a mountingface, the positioning and the amount of solder is hard to control.Especially during reflow of the solder, an undesired repositioning oflight-emitting elements may therefore occur.

It has been found that it is advantageous to apply contact material suchas solder paste on the at least one light emitting element, inparticular on contact patches of the at least one light emittingelement, for instance when the at least one light emitting element isalready fixed on the supporting layer. The supporting layer may be usedfor a precise positioning of the at least one light-emitting element,wherein the at least one light-emitting element may be connected to thecontact sections. For instance, the at least one light-emitting elementis applied to the mounting face(s) such that the contact materialtouches the contact sections. The contact material may be subjected toreflow and/or curing. The supporting layer may be removed before, afteror during the reflow and/or curing of the contact material.

According to another exemplary embodiment of the invention, applying theat least one light-emitting element fixed on the supporting layer to theat least one mounting face comprises bending the supporting layer toconform the shape of the at least one mounting face. Bending thesupporting layer may in particular be useful to conform the shape ofmultiple mounting faces, such that light-emitting elements may bemounted on multiple mounting faces simultaneously.

In an embodiment, the light-emitting elements fixed on the supportinglayer may be applied by means of SMT techniques. The supporting layermay be picked up by one or more holding devices such as suction nozzles.For instance, for each light-emitting element or groups oflight-emitting elements (e.g. with each group corresponding to amounting face), a holding device may be used. The holding devices may bepositioned and rotated in respect to each other to obtain a shape of thesupporting layer that corresponds to the shape of the mounting face(s)and to apply the light-emitting elements on the mounting face(s).

According to another exemplary embodiment of the invention, thesupporting layer has at least one predetermined bend line. The bend linemay for instance correspond to lines separating sections of thesupporting layer, wherein each section corresponds to a light-emittingelement or a group of light-emitting elements corresponding to amounting face. By means of bend lines, the precision of the bending ofthe supporting layer and therefore the precision of the positioning ofthe light-emitting elements can be significantly improved. Bend linesmay for instance be formed by perforations in the supporting layer.Other configurations may also be possible in addition or as alternative,such as a thickness reduction and/or a different material with higherflexibility compared to the remainder of the supporting layer.

According to another exemplary embodiment of the invention, applying theat least one light-emitting element fixed on the supporting layer to theat least one mounting face comprises a cutting of the supporting layer.In an embodiment, the supporting layer may be cut before thelight-emitting element(s) are fixed on the supporting layer. Forinstance, the supporting layer may be cut into segments, wherein eachsegment supports a group of light-emitting elements. Each group oflight-emitting elements may for example correspond to a mounting face,such that strips of supporting layers are obtained that can be appliedindependently to each mounting face. In another embodiment, thesupporting layer may be cut after fixing the light-emitting element(s),but before contact material is applied. In another embodiment, thesupporting layer may be cut after the at least one light-emittingelement has been fixed and the contact material has been applied.

As a supporting layer, for instance polyimide adhesive tape may be used.The polyimide adhesive tape may be removed after the contact materialhas been cured, e.g. after a reflow of solder paste used as contactmaterial. In another embodiment, a supporting layer with a curableadhesive layer on the surface may be used, e.g. an UV curable adhesivetape. In this case, the supporting layer can be removed more easilybefore curing the contact material by exposing the UV curable adhesiveto UV light, wherein the light-emitting element(s) may be released fromthe supporting layer. A curing of the contact material may then beperformed without the supporting layer.

The at least one light-emitting element may in particular comprise atleast one semiconductor element capable of light emission. Inparticular, at least one light-emitting element may comprise at leastone LED. LEDs may comprise at least one semiconductor element such as ap-n-junction, a diode, and/or a transistor. For instance, the LEDs maybe provided in form of separate or combined LED dies and/or LEDpackages, wherein particular at least one LED may be arranged on asubstrate, e.g. a sapphire substrate. An LED package may comprise awavelength conversion element (e.g. based on phosphor) and/or maycomprise at least one optical element such as a diffusing layer, adiffractive element (e.g. a lens) and/or a reflective element (e.g. areflector cup). The LED or LEDs may for instance be integrated into anLED lead frame.

The support and/or the lighting device according to the invention may inparticular be configured for a use in automotive lighting, e.g. asautomotive head light.

The features and example embodiments of the invention described abovemay equally pertain to the different aspects according to the presentinvention.

It is to be understood that the presentation of the invention in thissection is merely by way of examples and non-limiting.

Other features of the invention will become apparent from the followingdetailed description considered in conjunction with the accompanyingdrawings. It is to be understood, however, that the drawings aredesigned solely for purposes of illustration and not as a definition ofthe limits of the invention, for which reference should be made to theappended claims. It should be further understood that the drawings arenot drawn to scale and that they are merely intended to conceptuallyillustrate the structures and procedures described herein.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a schematic representation of a first embodiment of asupport in a side view;

FIG. 2 shows a schematic representation of the first embodiment of asupport in a top view;

FIG. 3 shows a schematic representation of the first embodiment of asupport in a front view;

FIG. 4 shows a schematic representation of the first embodiment of asupport in a perspective view;

FIG. 5 shows a schematic representation of a first embodiment of alighting device in a perspective view;

FIG. 6 shows a schematic representation of a second embodiment of alighting device in a perspective view;

FIG. 7 shows a schematic representation of a second embodiment of alighting device in a perspective view;

FIG. 8 shows a schematic representation of a third embodiment of alighting device in a perspective view;

FIG. 9 shows a schematic representation of a fourth embodiment of alighting device in a perspective view;

FIG. 10 shows a schematic representation of a fifth embodiment of alighting device in a perspective view;

FIG. 11 shows a schematic representation of a sixth embodiment of alighting device in a perspective view;

FIG. 12 shows a schematic representation of a seventh embodiment of alighting device in a perspective view; and

FIG. 13 a-d show schematic representations of an embodiment of a methodfor producing a lighting device.

DETAILED DESCRIPTION

The following description serves to deepen the understanding of thepresent invention and shall be understood to complement and be readtogether with the description as provided in the above summary sectionof this specification.

FIGS. 1, 2, and 3 show schematic representations of a first embodimentof a support 2 for at least one light-emitting element in a side view,top view, and front view, respectively. In FIG. 4 , the first embodimentof a support 2 is shown in a perspective view.

As can be seen in particular in FIGS. 1 and 2 , the support 2 comprisesa mounting section 4 with three mounting faces 6 a, 6 b, 6 c, whereinthe mounting faces 6 a, 6 b, 6 c have an arrangement direction 8. Themounting faces 6 a, 6 b, 6 c are configured for accommodatinglight-emitting elements arranged along the arrangement direction 8. Themounting face 6 b is arranged between the other two mounting surfaces 6a, 6 c and is arranged substantially perpendicular to the other twomounting surfaces 6 a, 6 c.

A body section 10 is arranged adjacent to the mounting section 4 and isin thermal contact to the mounting section 4. The support 2 comprisesconductors 12 for providing electric connection from the body section 10to the mounting faces 6 a, 6 b, 6 c, such that light-emitting elementsmay be provided with electrical power by connecting the body section 10to a power source. The mounting section 4 and body section 10 comprise alayered structure of conductors 12 formed from metallic sheet material,in particular sheet material based on copper, and insulating layers 13disposed in between the conductors 12.

An extension direction of the metallic sheet material forming theconductors 12 and the insulating layers 13 extends substantiallyperpendicular to the arrangement direction 8 of the mounting faces 6 a,6 b, 6 c in the mounting section. In part of the body section 10, theextension direction extends substantially parallel to the arrangementdirection 8. The layered structure of conductors 12 and insulatinglayers 13 comprises an angled section 18, wherein a length of the bodysection 10 extends substantially parallel to the arrangement direction8.

As can be seen in FIG. 1 , the mounting faces 6 a, 6 b, 6 c comprisecontact sections 16 along the arrangement direction 8, each contactsection 16 corresponding to a conductor 12 and being separated by aninsulating section formed by the insulation layers 13. The metallicsheet material forming the conductors 12 comprises a main face and sidefaces, wherein each of the contact sections 16 is respectively formed bya side face of metallic sheet material.

As can be seen in particular from the front view in FIG. 3 , the bodysection 10 protrudes sidewards from the mounting faces 6 a, 6 b, 6 crelative to the arrangement direction 8. For instance, when a viewerfaces the mounting face 6 b, the body section extends beyond the edgesof the mounting faces 6 a, 6 b, 6 c. That is, the body section 10 has anincreased width in comparison to the mounting section 4.

The body section 10 has an increasing cross-sectional area withincreasing distance from the mounting section 4, which is in particularapparent from the top view in FIG. 2 . The body section 10 has atriangular cross section with the mounting section 4 being arranged onan edge of the triangular cross section. The triangular cross sectionhas an opening angle of 45°. As already mentioned above, the bodysection may provide an electrical connection to the at least onemounting face and may act simultaneously as a heat sink as well as aheat conductor, which is particularly advantageous when light-emittingelements with a high heat output are used, e.g. LED light sources forapplications such as automotive head lighting. As the body section 10protrudes sidewards from the mounting faces 6 a, 6 b, 6 c, the volume ofthe body section 10 is enlarged, and the body section 10 providessignificantly improved heat transfer from the mounting section 4 whileat the same time providing effective electrical conductivity and opticalproperties suitable for retrofitting applications.

In particular, the illumination pattern of light sources such as halogenbulbs may be reproduced very closely with light-emitting elementsmounted in the mounting faces 6 a, 6 b, 6 c of the support 2. Each ofthe mounting faces 6 a, 6 b, 6 c is configured for accommodatingmultiple light-emitting elements arranged along the arrangementdirection 8. In this first embodiment, the mounting faces 6 a, 6 b, 6 ceach comprise six contact sections 16 along the arrangement direction 8,each contact section 16 corresponding to a conductor 12 and beingseparated by an insulating section 13. The arrangement direction maycorrespond to the extension direction of a filament in an incandescentlight source.

A first embodiment of a lighting device 20 according to the invention isshown in FIG. 5 , wherein the lighting device 20 comprises the firstembodiment of a support 2 as depicted in FIGS. 1-4 . Five light-emittingelements 22 are mounted along the arrangement direction 8 of eachmounting face 6 a, 6 b, 6 c. Each light-emitting element 22 is inelectrical contact to two neighboring (alternating) contact sections 16.

In FIG. 6 , a second embodiment of a lighting device 20 according to theinvention is shown, wherein a socket 24 for connection to a power sourceis provided, wherein the socket 24 is connected to the body section 10of the support 2. The support 2 is configured according to the firstembodiment shown in FIGS. 1-4 . The socket 24 represents a standardsocket corresponding to a H7 halogen lamp in automobile applications.

FIG. 7 to FIG. 12 show respective further embodiments of a lightingdevice 20 according to the invention, wherein in contrast to the firstembodiment of the invention shown in FIG. 5 , a different control of theconductors 12 a to 12 f is illustrated enabling other functions of themultiple lighting functions of the lighting device 20, and/or comprisingoptional further structural features.

FIG. 7 shows an embodiment of the present invention that is based on thelighting device shown in FIG. 5 . Each contact section 16 corresponds toa conductor 12 a to 12 f. Between two neighboring contact sectionscorresponding to the conductors 12 a to 12 f, a respective insulatingsection 13 is comprised by the support 2. Each light-emitting element 22is a LED die. In order to enable multiple lighting functions, such aslow beam, DRL, PL, or a combination thereof, and/or providing beamdynamics, such as boosting, dimming, fast switching, or a combinationthereof, one or more voltages can be applied to any combination of theconductors 12 a to 12 f resulting in one or more voltages being appliedto the LED dies. The one or more voltages may for instance be applied ina timely manner, e.g. in certain pre-defined time intervals, e.g.resulting in a running light enabled by the support. As shown in FIG. 5, conductor 12 a is applied with a + polarity, conductor 12 f is appliedwith a − polarity, while conductors 12 b to 12 e are not connected (asindicated by ‘NC’). This may for instance result in that all of the LEDdies 22 of the example embodiment shown in FIG. 5 emit light as definedby the respective LED dies 22.

In FIG. 8 , conductors 12 a and 12 b are applied with a voltage ofalternating polarity (12 a: + polarity, and 12 b: − polarity),conductors 12 e and 12 f are applied with a second voltage (e.g.different from voltage applied to conductors 12 a, 12 b) of alternatingpolarity (12 e: + polarity, and 12 f: − polarity), and conductors 12 cand 12 d are not connected (as indicated by ‘NC’), resulting in that LEDdies 22 coupled to the conductors 12 a and 12 b are switched on, andfurther, the LED dies 22 coupled to the conductors 12 e and 12 f areswitched on, while the other LED dies 22 are switched off as well.

The example embodiment of a support 2 shown in FIG. 9 comprises anoptional sensor 14 a, wherein the sensor in FIG. 9 is a temperaturesensor 14 a and is mounted on the side of the support 2. Via theconductors 12 c and 12 d, information gathered by the temperature sensor14 a (e.g. temperature information indicative of a temperature valuemeasured in the vicinity of the LED dies 22) can be read. Conductors 12c and 12 d are applied with a voltage of alternating polarity (12 c: −polarity, and 12 d: + polarity), while the conductors 12 a, 12 b, and 12e, 12 f are not connected (as indicated by ‘NC’). With this controllingof the conductors, information gathered by the temperature sensor 14 amay be read. In case e.g. information of the temperature sensor 14 bshould not be read, the conductors 12 c and 12 d applied with arespective voltage as shown, can result in the respective LED diesconnected via the conductors 12 c, 12 d being switched on.

In contrast, in FIG. 11 , another sensor 14 b, e.g. a temperature sensoris comprised by the support, wherein this sensor 14 b is located on aside of the support and is coupled to the conductors 12 c, 12 d, and 12e. Via this coupling, e.g. information gathered by the sensor 14 b,and/or controlling of the sensor 14 b is enabled.

In FIG. 12 , a further sensor 14 c, e.g. a temperature sensor 14 c iscomprised on a top side of the support. In this embodiment, therespective sensor 14 c is coupled via the conductor 12 a enablinginformation gathered by the respective sensor 14 c (e.g. as disclosedabove) at least to be read and/or to control the respective sensor 14 caccordingly.

In FIG. 10 , the LED dies 22 comprise a specific LED die 22 a, which maybe a LED die enabled to emit light of a wavelength resulting in thecolor of yellow and/or blue. In this way, e.g. emitting of cold-white orwarm-white light may be enabled.

Example embodiment according to all exemplary aspects of the presentinvention enable one or more of the following features: each Cu(copper)-Stripe is an electrical port (e.g. conductor); addressing LEDdies individually or in groups (all LEDs on) is enabled; addressing LEDsindividually or in groups (welcome mode) is enabled; placing additionalLEDs at different locations (e.g. a LED of another color, such as a blueLED) is enabled; and using polarity of LEDs to realize dual or multiplefunctions (e.g. turning LEDs on in a sequential, thus timely differentmanner) is enabled.

Between connectors, polarity may be different (prior art: higher orderconnector has higher potential). Further, LED dies can be turned off,sensor(s) are enabled, and/or other LED dies can be operatedselectively. In a normal operation of example embodiments of theinvention, all LED dies are operated in series (e.g. connector 1 haspositive potential, last connector has negative potential, allconnectors in between are isolated, thus series operation is realized).

FIG. 13 a-d show schematic illustrations of a method for producing alighting device according to the invention and in particular forproducing the lighting device according to the first embodiment.

A support 2 is provided, e.g. configured according to the firstembodiment shown in FIGS. 1-4 . The support 2 may be provided bystacking of metallic sheets and disposing insulating layers between themetallic sheets, wherein the insulating layers can be formed by adhesiveapplied to the metallic sheets. The metallic sheets may be bent to forman angled section with a substantially perpendicular angle and amaterial removal may be performed to obtain a shape of the support 2 asdepicted in FIGS. 1-4 .

Light-emitting elements 22 are then mounted on the support 2 as shown inFIG. 13 a-d . FIG. 13 a represents a front view, wherein the lightemitting elements 22 are removably fixed on a supporting layer 26, forinstance an adhesive polyimide tape or an UV curable adhesive tape. Thesupporting layer 26 has predetermined bend lines in form of perforations28 that divide the light-emitting elements 22 into groups, each groupcorresponding to a mounting face 6 a, 6 b, 6 c. Solder paste as acontact material is applied on contact sections of the light-emittingelements 22 (not shown).

The supporting layer 26 is picked up by suction nozzles 30 a, 30 b, 30 cof a holding device. Three suction nozzles 30 a, 30 b, 30 c or threegroups of suction nozzles 30 a, 30 b, 30 c are used, each correspondingto a group of light-emitting elements 22 and a mounting face 6 a, 6 b, 6c. After the light-emitting elements 22 corresponding to mounting face 6b have been applied, as shown in a top view of the support 2 in FIG. 13b , the suction nozzles 30 a, 30 c are repositioned and rotated suchthat the supporting layer 26 is bent at the perforations 28 to conformthe shape of the mounting faces 6 a, 6 b, 6 c, as shown in FIG. 13 c.

As an alternative, the supporting layer 26 may be cut into strips, eachstrip corresponding to a mounting face 6 a, 6 b, 6 c (not shown) and thestrips are applied in a similar manner.

The solder paste is subjected to a reflow after positioning of thelight-emitting elements 22 such that the solder paste permanentlyconnects the light-emitting elements 22 to the contact sections 16 ofthe mounting faces 6 a, 6 b, 6 c. The supporting layer 22 may be removedfrom the light-emitting elements after reflow (e.g. when adhesivepolyimide tape is used) or before reflow (e.g. when using UV curableadhesive tape that can be exposed to UV light to reduce adhesion to thelight-emitting elements 22). A light-emitting device 20 is obtained asshown in FIG. 13 d . Example embodiments of the present invention enablee.g. an architecture that is 100% compatible to the H7 architecture ofcar lights. Further, it is possible to incorporate multiple lightingfunctions (low beam, DRL (Daytime Running Light), PL (Position Light),etc.) and/or providing beam dynamics (boosting, dimming, fast switching,etc.) with the same retro fit lighting module by enabling that a voltagecan be applied between any of the contact sections when connected to apower source.

A support for light-emitting elements may comprise a mounting section(4) with at least one mounting face (6 a, 6 b, 6 c). The at least onemounting face (6 a, 6 b, 6 c) may be arranged in an arrangementdirection (8) and may be configured for accommodating at least onelight-emitting element (22) arranged along the arrangement direction(8). The support may comprise a body section (10) arranged adjacent tothe mounting section (4). The support may comprise conductors (12) forproviding electric connection from the body section (10) to the at leastone mounting face (6 a, 6 b, 6 c). The at least one mounting face (6 a,6 b, 6 c) may comprise at least two contact sections (16) along thearrangement direction (8). Each contact section may correspond to aconductor (12). The body section (10) may protrude sidewards from the atleast one mounting face (6 a, 6 b, 6 c).

The body section (10) may be at least in sections an increasingcross-sectional area with increasing distance from the mounting section(4), in particular a triangular cross section at least in sections withthe mounting section (4) being arranged on an edge of the triangularcross section. The triangular cross section may have an opening angle of0° to 90°, in particular 30° to 45°.

The mounting section (4) and/or body section (10) may comprise a layeredstructure of conductors (12) and insulating layers (13).

The conductors (12) may comprise a metallic sheet material. The metallicsheet material may be based on copper.

The metallic sheet material may comprise a main face and side faces.Each of the contact sections (16) may be respectively at least partiallyformed by a side face of the metallic sheet material.

An extension direction of the layered structure of conductors (12), inparticular of the metallic sheet material, and insulating layers (13) inthe mounting section (4) may extend substantially perpendicular orsubstantially parallel to the arrangement direction (8) of the at leastone mounting face.

The layered structure of conductors (12) and insulating layers (13) maycomprise an angled section (18). A length of the body section (10) mayextend substantially parallel to the arrangement direction (8).

The mounting section (4) may comprise at least two mounting faces (6 a,6 b, 6 c) being arranged adjacent to each other. At least two mountingfaces (6 a, 6 b, 6 c) may be arranged at an angle to each other orsubstantially parallel to each other.

The mounting section (4) may comprise three mounting faces (6 a, 6 b, 6c). One of the three mounting faces (6 b) may be arranged between theother two mounting surfaces (6 a, 6 c). One of the three mounting faces(6 b) may be arranged between the other two mounting surfaces (6 a, 6 c)with an enclosing angle of 45° to 135°, in particular 45° to 75° orsubstantially perpendicular to the other two mounting surfaces (6 a, 6c).

The at least one mounting face (6 a, 6 b, 6 c) may be configured foraccommodating multiple light-emitting elements (22) arranged along thearrangement direction (8). The at least one mounting face (6 a, 6 b, 6c) may comprise at least three alternating contact sections (16) alongthe arrangement direction (8). Each alternating contact section (16) maycorrespond to a conductor (12) and may be separated by an insulatingsection.

A lighting device may comprise a support (2) according to any ofembodiments discussed herein. The lighting device may comprise at leastone light-emitting element (22) mounted along the arrangement direction(8) of at least one mounting face (6 a, 6 b, 6 c). The at least onelight-emitting element (22) may be in electrical contact to at the leasttwo contact sections (16).

The lighting device may comprise a socket (24) for connection to a powersource. The socket (24) may be connected to the body section (10).

A method for producing a lighting device (20) may comprise providing asupport (2) according to any of the embodiments discussed herein. Themethod may comprise mounting at least one light-emitting element (22)along an arrangement direction (8) of at least one mounting face (6 a, 6b, 6 c). The at least one light-emitting element (22) may be broughtinto electrical contact to a contact sections (16).

The method may comprise a stacking of metallic sheets and disposinginsulating layers (13) between the metallic sheets. The metallic sheetsmay be bent to form an angled section (18). The angled section may be asubstantially perpendicular angle.

The method may comprise a material removal, in particular after astacking of metallic sheets.

The mounting of the at least one light-emitting element (22) maycomprise removably fixing the at least one light-emitting element (22)on a supporting layer (26). The mounting may comprise applying a contactmaterial on the at least one light-emitting element (22). The mountingmay comprise applying the at least one light-emitting element (22) fixedon the supporting layer (26) to the at least one mounting face (6 a, 6b, 6 c). The contact material may connect the at least onelight-emitting element (22) to the contact sections (16).

Applying the at least one light-emitting element (22) fixed on thesupporting layer (26) to the at least one mounting face (6 a, 6 b, 6 c)may comprise bending the supporting layer (26) to conform to the shapeof the at least one mounting face (6 a, 6 b, 6 c). The supporting layer(26) may have at least one predetermined bend line (28). The bend linemay be a material weakening such as a material reduction or aperforation. Applying the at least one light-emitting element (22) fixedon the supporting layer (26) to the at least one mounting face (6 a, 6b, 6 c) may comprise a cutting of the supporting layer (26).

In the present specification, any presented connection in the describedembodiments is to be understood in a way that the involved componentsare operationally coupled. Thus, the connections can be direct orindirect with any number or combination of intervening elements, andthere may be merely a functional relationship between the components.

Moreover, any of the methods, processes and actions described orillustrated herein may be implemented using executable instructions in ageneral-purpose or special-purpose processor and stored on acomputer-readable storage medium (e.g., disk, memory, or the like) to beexecuted by such a processor. References to a ‘computer-readable storagemedium’ should be understood to encompass specialized circuits such asFPGAs, ASICs, signal processing devices, and other devices.

The expression “A and/or B” is considered to comprise any one of thefollowing three scenarios: (i) A, (ii) B, (iii) A and B. Furthermore,the article “a” is not to be understood as “one”, i.e. use of theexpression “an element” does not preclude that also further elements arepresent. The term “comprising” is to be understood in an open sense,i.e. in a way that an object that “comprises an element A” may alsocomprise further elements in addition to element A.

It will be understood that all presented embodiments are only exemplary,and that any feature presented for a particular example embodiment maybe used with any aspect of the invention on its own or in combinationwith any feature presented for the same or another particular exampleembodiment and/or in combination with any other feature not mentioned.In particular, the example embodiments presented in this specificationshall also be understood to be disclosed in all possible combinationswith each other, as far as it is technically reasonable and the exampleembodiments are not alternatives with respect to each other. It willfurther be understood that any feature presented for an exampleembodiment in a particular category (method/apparatus/computerprogram/system) may also be used in a corresponding manner in an exampleembodiment of any other category. It should also be understood thatpresence of a feature in the presented example embodiments shall notnecessarily mean that this feature forms an essential feature of theinvention and cannot be omitted or substituted.

The statement of a feature comprises at least one of the subsequentlyenumerated features is not mandatory in the way that the featurecomprises all subsequently enumerated features, or at least one featureof the plurality of the subsequently enumerated features. Also, aselection of the enumerated features in any combination or a selectionof only one of the enumerated features is possible. The specificcombination of all subsequently enumerated features may as well beconsidered. Also, a plurality of only one of the enumerated features maybe possible.

The sequence of all method steps presented above is not mandatory, alsoalternative sequences may be possible. Nevertheless, the specificsequence of method steps exemplarily shown in the figures shall beconsidered as one possible sequence of method steps for the respectiveembodiment described by the respective figure.

The invention has been described above by means of example embodiments.It should be noted that there are alternative ways and variations whichare obvious to a skilled person in the art and can be implementedwithout deviating from the scope of the appended claims.

What is claimed is:
 1. A lighting device comprising: a supportcomprising a mounting section having at least one mounting face, the atleast one mounting face having an arrangement direction and comprisingat least two contact sections along the arrangement direction; thesupport further comprising a body section adjacent to the mountingsection; the support further comprising a plurality of layeredconductors connecting the body section to the at least one mountingface; and at least one light-emitting element mounted along thearrangement direction of the at least one mounting face such that the atleast one light-emitting element is in electrical contact to the atleast two contact sections.
 2. The lighting device of claim 1, furthercomprising: a socket connected to the body section for connection to apower source.
 3. The lighting device of claim 1, wherein the bodysection has a length that extends parallel to the arrangement direction,such that the body section protrudes sidewards from the at least onemounting face.
 4. The lighting device of claim 3, wherein the bodysection has an increased cross-sectional area with increasing distancefrom the mounting section.
 5. The lighting device of claim 1, wherein anextension direction of the layered conductors extends substantiallyperpendicular to the arrangement direction of the at least one mountingface.
 6. The lighting device of claim 1, wherein the layered conductorscomprises an angled section.
 7. The lighting device of claim 1, furthercomprising an insulating section separating two neighboring contactsections of the at least two contact sections.
 8. The lighting device ofclaim 1, wherein the at least one light-emitting element is configuredto emit a light of different wavelength than another light-emittingelement.
 9. The lighting device of claim 1, wherein a voltage is appliedbetween any of the at least two contact sections when the body sectionis connected to a power source.
 10. The lighting device of claim 1,wherein at least one contact section is not connected so that a voltageis not applied to the at least one contact section when the body sectionis connected to a power source.